With max new quality levels, 95, it gives the following error on start-up:

Failed to load mods: Error while loading quality prototype "x99" (quality): beacon_power_usage_multiplier must be >= 0.01 but 0.01 was given. Modifications: Unlimited Quality

Environment:

Factorio 2.1.8 (base, recycler, quality, space-age)
Unlimited Quality 0.0.7

Error confirmed to occur with no other mods.

Interesting error message eh? Floating point errors and some obscurity from the API documentation. It should be fixed now with 0.0.8.

Cool.

Not that I would play with 95 extra levels, but I needed an extreme test case for adding support for modded quality levels to my Quality Down-Binning mod, and this mod was perfect. So thanks for the quick migration to 2.1.